assuming he isn't lieing wherever he is making the presentation ( assuming its a highschool or college library) it should be surprising to the average person.
i'l leave the link to part 1 here, after watching all 5 parts i recommend people do their own research and think about it.
want more watch the movie "fat head" on netflix or something
http://www.youtube.com/watch?v=exi7O1li_wA&feature=related